---
slug: "Warmup"
name: "Warmup"
type: "Primitives"
layer: "Infrastructure"
ref: "Warmup#ed16"
sema_id: "sema:Warmup#mh:SHA-256:ed16f499e655d6d252a2bae39a8cc87ec8497426107905501920ac47644be9ef"
tags: ["Infrastructure","Primitives"]
updated: 2026-11-11
mindscape: "bootstrap"
index_url: https://mindscape.pages.dev/bootstrap/index.json
url: https://mindscape.pages.dev/bootstrap/Warmup/
related: ["Greet","System","Throttle","ContextFirst"]
---

# Warmup

Gradual capacity increase to stabilize cold systems

Layer: Infrastructure · Category: Primitives

## Mechanism

On activation, accept load at `initial_capacity` and raise the accepted-load cap to full over `ramp_duration`, following `curve`. This prevents a thundering herd against a cold system. What the ramp establishes is the cap, not readiness — a system whose cap has reached full may still be cold inside. Utilizes [Greet](https://mindscape.pages.dev/bootstrap/Greet.md), [Throttle](https://mindscape.pages.dev/bootstrap/Throttle.md).

## Invariants

- Capacity Limit: Accepted_Load <= Current_Warmup_Cap(t)

## Preconditions

- [System](https://mindscape.pages.dev/bootstrap/System.md) state is inactive or reset

## Postconditions

- Accepted-load cap has reached full capacity
- [System](https://mindscape.pages.dev/bootstrap/System.md) is accepting load at full cap — readiness of internal state (caches, compiled paths) is a separate signal this pattern does not assert

## Failure modes

- Premature Load: Traffic arrives before warmup completes.
- False Warmth: Timer completes but internal state (e.g. cache) is still cold.

## Parameters

- `curve` (Enum, {Linear, Exponential, Step}): Default: Linear
- `initial_capacity` (Float, [0.0, 1.0]): Starting capacity as fraction of full (0 = cold start)
- `ramp_duration` (Duration, [10s, 1h]): Time to reach full capacity from initial

## Builds on

- [Greet](https://mindscape.pages.dev/bootstrap/Greet.md) (Infrastructure; References)
- [System](https://mindscape.pages.dev/bootstrap/System.md) (Infrastructure; References)
- [Throttle](https://mindscape.pages.dev/bootstrap/Throttle.md) (Infrastructure; References)

## Used by

- [ContextFirst](https://mindscape.pages.dev/bootstrap/ContextFirst.md) (Mind; References)

## Identity

- Sema ID: `sema:Warmup#mh:SHA-256:ed16f499e655d6d252a2bae39a8cc87ec8497426107905501920ac47644be9ef`
- Ref: `Warmup#ed16`
- Supersedes:
  - `sema:Warmup#mh:SHA-256:28c434be6a4de607158375965b76e4cb67d742481b6b6fb840326a7610703ceb`
  - `sema:Warmup#mh:SHA-256:7ad05d8c27bdabb565d72ce56d8a896af84e5c35d5bc56afb7bdecdac5b40551`
  - `sema:Warmup#mh:SHA-256:32d4b559fc99f4dfa7a154487385194fe1c4f5cd3589a5910d2ee35eadc38fff`
  - `sema:Warmup#mh:SHA-256:316ee053b8fda86e03974bb8baaf6c82b4de0b07ea7e55fa38d337309cfe25de`

## Links

- [Pattern page](https://mindscape.pages.dev/bootstrap/Warmup/)
- [View in the interactive graph](https://mindscape.pages.dev/bootstrap/#Warmup)
- [JSON](https://mindscape.pages.dev/bootstrap/Warmup.json)
- [Index of all patterns](https://mindscape.pages.dev/bootstrap/index.json)